Balanced slide-valve



H. OTTO xv 12.?. BELL.V BALANCBD SLIDE VALVE.

Patented Decz 18,1883.

UNITE STATES PATENT Ormea.

HENRY O'ITO ANDPATBICK F. BELL, OF BLOOlWIIN-GTON, ILLINOIS.

BALANCED SLIDE-VALVE.

SPECIFICATION forming part of Letters Patent No. 290,650, dated December18, y1883,

Application filed May 14, 1883.

To @ZZ .whom it may concern,.-

Be it known that we, HENRY OTTO and PAT- RICK F. BELL, citizens of theUnited States, both residing at Bloomington, in the `county of McLeanand State of Illinois, have invented a new and useful Improvement inBalanced Slide-Valves, of which thefollowing is a speciiication,reference being had to the accompanying drawings, forming part thereof.

Our invention relates to improvements in balanced slide-valves, llinwhich the steampressure on the valve and valve-scat is reduced to aminimum by converting the sliding friction (to the most practicalextent) into a revolving one. We attain this object by the mechanismillustrated in the accompanying drawings, in which- Figure 1 is avertical section of the entire mechanism of the slide-valve. Fig. 2 is aper spective side view of the combined active parts as they appear afterthe removal of the valveseat, steam-chest, steam-chest cover, and yoke,with valve-stem. Fig. 3 is a perspective view of the piston as itappears after the removal of the cover on the tunnel. Fig. 4 is a topview of the valve only. Fig. 5 is a perspective view of the piston in aninverted position as it appears after the removal of the steam-packing.FigQG is a perspective side view of the rollers with straps and pins.

Similar letters refer to similar parts throughout the several views.

The valve A is shaped on `its sliding face similar to those in commonuse; but the upper part of it is formed into an upright cylinder, a,open on either end, and provided with an open passage, b b, from the topend downward through its front and back wall, to clear the suspended barB, referred to hereinafter. (See Fig. 2.) The passages b b of the pistonC is provided with a cover, e e, forming a tunnel or opening, D, whereina set of rollers, t t' t' t', (three or more,) is placed, which arecaused, by the travel of the valve A, to run either way on the top faceof said suspended bar B, the inside top face of said tunnel l), on thepiston C, bearing on the top faces of said rollers i t' ifi, so theywill receive the whole steam-pressure on the top end of the piston C andtransfer it to said suspended bar B. rllhe rollers z' t 13 i areconnected by two outside straps, J J, with (Model.)

suspended bar B only half the distance of the Y travel of the valve A,and will run without oiling. The suspended steel bar B is connected bystrong studs m m or bolts on either end tothe bottom faces of twopedestals, M M, or blocks, suspended from the inner face of thesteamchest cover N, and fastened by nuts p p outside. Said bar B mayalso be fixed to projecting shoulders on the inner walls of thesteamchest O, if preferred. The piston G has a groove, t, near its lowerend, for the reception of the steam-packing T, and on its bottom end isformed into a cavity, reaching up to the bottom face of the aforesaidbottom plate f, to allow space for the exhaust-steam striking againstit, thereby, with the addition of one atmospheric pressure, reducing.partly the steam-pressure on top of the piston C. The suspendedpedestals M M on the steam-chest cover N are of uniform breadth with thesuspendedbar B, to clear the passage b I) of the cylinder a on the valveA. The area of the piston G ought to be equal to the three port-holes inthe valve-seat u. The yoke l?,

with valve-stem, is shaped similar to the common one. Our valve is builthigher than the common one 5 consequently the steam-chest has to behigher also, which is very favorable to work off the condensed waterfreely.

In repairing, if the faces of the chest and coverneed replaning, thebottom ends of the suspended pedestals have to be reduced likewise, tokeep the suspended bar in the same relation with the valve and piston asbefore.

Being both practical machinists for a number of years, we have had theopportunity to learn the results of all the different inventions for thesame purpose up to the present time, thereby getting well acquaintedwith the peculiar faults of each of them, and we are well convinced thatour invention is the only prac- IOO tical way to overcome all of thosefaults. Be sides, our system is calculated for easy repair, and does notrequire first-class hands to put it in working order.

W'e are not strictly bound to parallel lines. By shaping` the topsurface of the suspended bar a little oval sidewise, the piston andvalve will adjust themselves in case the valve-seat should be out oflevel sidewise7 and any unevenness lengthwise Will be overcome by thepiston in lowering` and raisingitself for adjustment.

Vliat We claim, and desire to secure by Letters Patent, is-

The combination, in a slide-valve, of a suspended. fixed bar inconnection with a piston in an upright central cylinder on the valve,said piston having a covered tunnel and a set of connected rollersplaced within7 bearing` With their top faces to the inner top face of 2oHENRY OTTO. PATRICK F. BELL.

Vitnesses:

CHRISTIAN KoDn. JACOB SCHINADLER

